Analyzing principles of ortheopy according to phonetic opinions of Khalil -Ibn- Ahmad

Phonetic analysis of Arabic language has been begun with the publication of Khalil –Ibn– Ahmad's book, "Al-Ayn", in the second century A.H. The presented paper is a research on description of Arabic phonemes and vocal organs according to phonetic opinions of Khalil –Ibn– Ahmad. This great literary man as a founder of phonology in Arabic language influences ortheopy researchers in later ages and helps to presentation of descriptive phonetics. Finally we conclude that Quran ortheopy have been accomplished in the context of Arabic linguistic.